Vulnerability identifier: #VU57439

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31361

CWE-ID: CWE-754

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
PTX Series
Hardware solutions / Firmware
QFX Series
Hardware solutions / Firmware

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper check for unusual or exceptional conditions. A remote attacker can send specially crafted IP packets and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.3R1 - 17.3R3-S10, 17.4R1 - 17.4R3-S3, 17.4R2-S9, 18.1R1 - 18.1R4, 18.2R1 - 18.2R3-S6, 18.3R1 - 18.3R3-S3, 18.3R3-S1, 18.3R2-S3, 18.4R1 - 18.4R3-S6, 18.4R2-S3, 18.4R1-S5, 19.1R - 19.1R3-S5, 19.1R1-S4, 19.2R1 - 19.2R3-S1, 19.2R1-S4, 19.3R1 - 19.3R3-S2, 19.3R2 - 19.3R2-S5, 19.3R1-S1, 19.4R2 - 19.4R3-S4, 19.4R1 - 19.4R1-S3, 20.1R1 - 20.1R1-S4, 20.2R1 - 20.2R2-S3, 20.3R1 - 20.3R1-S2, 20.4R1 - 20.4R2, 21.1R1

PTX Series: All versions

QFX Series: All versions

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11223&cat=SIRT_1&actp=LIST

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.